When the distance between two charges is doubled, the force between them is reduced to one-fourth.

Here's why:

* Coulomb's Law: The force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. Mathematically:

* F = k * (q1 * q2) / r^2

* Where:

* F is the force

* k is Coulomb's constant

* q1 and q2 are the magnitudes of the charges

* r is the distance between the charges

* Doubling the distance: If you double the distance (r), the force will be reduced by a factor of (1/2)^2 = 1/4.

In summary: The force between two charges decreases rapidly as the distance between them increases.